Construction of a sitting device



CONSTRUCTION OF A SITTING DEVICE FiledDct. 12, 1951 .IIIlIIIILI III Patented Mar. 17, 1936 UNITED STATES PATENT OFFICE 2 Claims.

Subject matter of my invention is a chair, the seat of which is supported by a spring system which is fastened at its ends to supporting members of the chair frame,one of such members being 5 placed at the front of the chair frame on a level immediately below the seat, the other of such members being placed on a lower level and on the rearside of the chair frame.

The mentioned spring system comprises pref- 10 erably one or several spring blades, which run out in an essentially horizontal direction when starting from the frontal support-member whereas the rear portion of these spring blades which forms the continuation of the horizontal portion is bent 15 down in a backward convex curve; the end of this rear portion is fastened to the rear lower support at the chair frame.

In this way elasticity of the seat base is combined with stability. As supporting members for 20 the springs or the system of springs crossbars of the chair frame can be used.

The chair frame can comprise two side parts interconnected by the above mentioned crossbars. Each of these side parts of the chair frame can be 25 constructed out of bent rigid metal rods or metal tubings.

One mode of construction of such a chair is shown in the attached drawing; wherein Fig. 1 shows a vertical section view, Fig. 2 a plan and 30 Fig. 3 a front view of the chair. Fig. 4 is a view in perspective of the chair, as seen from below the lower surface of the seat.

In this case the chair frame consists of two side parts 9, g, each of which is formed out of a metal 5 rod or tubing bent to have the shape of a as shown in the drawing; and of crossbars, rods or tubings b, c, d which connect the two side parts 9, g of the framework to one another. The vertical portions of the [-shaped side parts 9, g are 4 situated at the front of the chair frame. The crossbar b connecting the vertical portions of the side parts g, g to one another is fastened in the height of the support of the seat. The crossbar c is fastened to the ends of the lower horizontal por- 45 tion of the side parts 9, g and is situated below the hind-part of the seat support on a lower level than that of crossbar b so as to be in immediate contact with the floor.

A spring blade f serves as a support for the seat 50 which for instance may be a leather cushion or the like. This spring blade is attached with its frontal end to the crossbar b and with its rear end to the crossbar 0. Beginning at b, the spring blade 1 first extends in a horizontal direction and is then 55 bent down in a backward convex curve to reach the rear lower crossbar c. The seat indicated in the drawing by e is disposed upon the horizontal straight portion of thespring blade 1 and may be fixed thereto in any suitable manner.

Under the load of a sitting person the spring blade 1 is deformed in such a manner that the horizontal straight portion of the spring blade held in its position by the curved portion of the spring, is turned down around an axis represented by crossbar I) which angle-movement is allowed by the amplification of the curvature of the rear portion of the spring blade.

In spite of the curved shape of the spring blade, which assures a high degree of elasticity stability of the seat-support is secured in so far as a deformation of the spring in a longitudinal direction cannot occur. A transversal deformation of the spring can be avoided by giving to the blade suflicient cross dimensions or breadth and giving to its ends a proper connection to the supporting crossbars b and c.

It is obvious that the chair frame and the spring system which is destined to support the seat as well as the shape and the mode of fastening the system of springs to the chair frame can be executed in various ways, and I therefore do not wish to have my invention confined to just the form of execution which is exemplified on the annexed drawing.

What I claim as my invention is:

1. A chair comprising spaced upright side frames, a front bar joining said side frames intermediate their height, a rear bar joining the side frames at a level below said front bar and rearwardly thereof, a spring blade connected at one end to said front bar and having a straight 5 horizontal portion extending from the front bar substantially to the rear of said side frames, said spring blade having an extension at the rear of said horizontal portion curved downwardly and connected to said rear bar, and a seat member carried by said spring blade.

2. As an article of manufacture the combination with a rigid chair frame, of a spring blade for supporting the load of a sitting person, said chair frame comprising spaced upright side frames, a front bar joining said side frames intermediate their height and a rear bar joining the side frames at a level below said front bar and rearwardly thereof, said spring blade being connected at one end to said front bar and having a straight horizontal portion extending from the front bar substantially to the rear of said side frames and an extension at the rear of said horizontal portion curved downwardly and connected to said rear bar.

RICHARD JOSEPH NEUTRA. 

